/* main.css - Core styles for Yusuf Özcan's portfolio */

@import url('https://fonts.googleapis.com/css2?family=Fira+Sans+Condensed:wght@300&family=IBM+Plex+Mono:wght@400;500&family=IBM+Plex+Sans:wght@200;400;600&display=swap');

/* --- Global Theme Variables (Light - Default) --- */
:root {
    --background-color: #f5f5f5;
    --secondary-bg-color: #f9f9f9; /* Add this new variable */
    --text-color: #333;
    --accent-color: #4a4a4a;
    --hover-color: #666;
    --footer-color: #333;
    --card-bg: #fff;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --border-color-light: #ddd;
    --border-color-dark: #444;
    --input-bg-light: #fff;
    --input-bg-dark: #1a1a1a;
    --input-text-light: #333;
    --input-text-dark: #eee;
    --link-color-light: #007bff;
    --link-color-dark: #6bbdff;
    --code-bg-light: #f0f0f0;
    --code-bg-dark: #252525;
    --code-border-light: #e0e0e0;
    --code-border-dark: #3a3a3a;
    --transition-speed: 0.3s;
    --input-bg: var(--input-bg-light);  
    --input-border: var(--border-color-light);  
}

/* Dark Theme*/
[data-theme="dark"] {
    --background-color: #1a1a1a;
    --secondary-bg-color: #222222;
    --text-color: #eee;
    --accent-color: #888;
    --hover-color: #aaa;
    --footer-color: #222;
    --card-bg: #2d2d2d;
    --card-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    --input-bg: var(--input-bg-dark);  
    --input-border: var(--border-color-dark);
}


/* Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* --- Apply Global Theme Variables --- */
body {
    font-family: 'IBM Plex Sans', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

html {
    scroll-behavior: smooth;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header & Navigation */
header {
    background-color: var(--background-color); /* Ensure header follows theme */
    padding: 1em 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1); /* Keep shadow consistent or adjust for dark */
    transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
}
[data-theme="dark"] header {
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.4); /* Darker shadow */
}


#navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    height: 20px;
}

.logo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    /* Optional: Add filter for dark mode if logo contrast is poor */
    transition: filter var(--transition-speed);
}
[data-theme="dark"] .logo img {
    /* filter: invert(1) hue-rotate(180deg); */ /* Example filter */
}


.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 2rem;
}

#navbar .nav-links a { /* Increased specificity */
    text-decoration: none;
    color: var(--text-color);
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 500;
    transition: color var(--transition-speed) ease;
    position: relative;
}

#navbar .nav-links a:hover,
#navbar .nav-links a.active {
    color: var(--hover-color);
}

#navbar .nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--accent-color);
    transition: background-color var(--transition-speed);
}

.hamburger {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-color); /* Ensure hamburger uses theme color */
    transition: color var(--transition-speed);
}

.language-switcher {
    display: flex;
    align-items: center;
}

#navbar .language-switcher button { /* Increased specificity */
    background: none;
    border: none;
    cursor: pointer;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 1rem;
    color: var(--text-color);
    margin-left: 1rem;
    transition: color var(--transition-speed) ease;
}

#navbar .language-switcher button:hover {
    color: var(--hover-color);
}

/* --- Global Theme Toggle Button Style --- */
.theme-toggle-button {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem; /* Adjust size as needed */
    margin-left: 1rem;
    padding: 5px;
    line-height: 1; /* Prevents extra space */
    color: var(--text-color); /* Use theme color */
    transition: color var(--transition-speed);
}
.theme-toggle-button:hover {
     color: var(--hover-color);
}


/* Main Content */
main {
    padding-top: 80px; /* Account for fixed header */
    min-height: calc(100vh - 120px); /* Full viewport minus header and footer */
}

section {
    padding: 4rem 0;
}

section h1 {
    font-family: 'Fira Sans Condensed', sans-serif;
    font-size: 2.5rem;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--text-color); /* Use theme color */
    transition: color var(--transition-speed);
}

section h2 {
    font-family: 'Fira Sans Condensed', sans-serif;
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--text-color); /* Use theme color */
    transition: color var(--transition-speed);
}

/* Footer */
footer {
    background-color: var(--footer-color);
    color: #eee; /* Usually keep footer text light */
    padding: 2rem 0;
    transition: background-color var(--transition-speed);
    text-align: center;
}
[data-theme="dark"] footer {
     color: #ccc; /* Slightly adjust if needed */
}


.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.footer-links a {
    color: #eee; /* Keep light */
    text-decoration: none;
    font-family: 'IBM Plex Mono', monospace;
    transition: opacity var(--transition-speed) ease;
}
[data-theme="dark"] .footer-links a {
    color: #ccc;
}

.footer-links a:hover {
    opacity: 0.8;
}

.social-icons {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.social-icons a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: white;
    transition: transform var(--transition-speed) ease, background-color var(--transition-speed) ease;
    border: none;
}

.social-icons a:hover {
    transform: translateY(-3px);
    background-color: #f0f0f0;
}

.social-icons img {
    width: 24px;
    height: 24px;
    object-fit: contain;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background-color: var(--accent-color);
    color: var(--background-color); /* Contrast color */
    text-decoration: none;
    border-radius: 4px;
    font-family: 'IBM Plex Mono', monospace;
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: var(--hover-color);
}

/* Links */
a {
    color: var(--link-color-light); /* Use theme variable */
    transition: color var(--transition-speed) ease;
    text-decoration: none; /* Optional: Remove default underline */
}
[data-theme="dark"] a {
    color: var(--link-color-dark);
}

a:hover {
    color: var(--hover-color);
    text-decoration: underline; /* Add underline on hover */
}

/* Media Queries */
@media (max-width: 768px) {
    .hamburger {
        display: block;
        position: absolute;
        right: 1rem;
        z-index: 1001;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--background-color);
        padding: 1rem;
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
        border-top: 1px solid var(--border-color-light); /* Add border */
    }
    [data-theme="dark"] .nav-links {
        border-top-color: var(--border-color-dark);
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.4);
    }


    .nav-links.show {
        display: flex;
    }

    .nav-links li {
        margin: 0.5rem 0;
    }

    .language-switcher {
        position: absolute;
        right: 4rem; /* Adjust if needed to accommodate theme toggle */
    }

    section h1 {
        font-size: 2rem;
    }

    section h2 {
        font-size: 1.5rem;
    }

    .footer-links {
        flex-direction: column;
        gap: 0.5rem;
    }
}